The perimeter of a rectangular board is 80 decimeters, and the ratio of width to length is 3:5. Saw the largest round table on the board. What is the area of the round table Decimeter?

Length: 80 / 2 * (5 / 8) = 25 decimeters
Width: 80 / 2 * (3 / 8) = 15 decimeters
The diameter of the largest circle is the width of the rectangle = 15 decimeters, so the radius is 7.5 decimeters
Circular area: π * 7.5 * 7.5 ≈ 176.625 square decimeters

The circumference of a rectangle is 80 decimeters, and its length is 18 decimeters. How many decimeters is its width? How many square decimeters is its area?

A rectangle has a circumference of 80cm. It is known that the width of the rectangle is one tenth of the length. What is the area of the rectangle?

The sum of length and width is 80 △ 2 = 40 cm
So the length is 40 × 10 ^ (10 + 1) = 400 / 11 cm
The width is 400 / 11 × 1 / 10 = 40 / 11 cm
So the area is 400 / 11 × 40 / 11 = 132 and 121 / 28 square centimeters

The perimeter of a square board is 12 decimeters. What is its area

Cut off the length of a rectangular board by 2 decimeters, and the perimeter of the remaining board is 36 decimeters. Find the perimeter of the original board

36+2*2=40dm

Cut off the length of a rectangular board by 2 decimeters, and the perimeter of the remaining board is 36 decimeters. What is the perimeter of the original board?

The original perimeter of the board is: 36 + 2 * 2 = 40 decimeters

Cut off the length of a rectangular board by 2 decimeters, and the perimeter of the remaining board is 36 decimeters. How many meters is the original perimeter of the board?

Assuming that the remaining board is a square, the side length of the square is 36 △ 4 = 9
The original rectangle length = 9 + 12 = 11, width = 9
Perimeter = 2 × (11 + 9) = 40 decimeters

Cut off the length of a rectangular board by 2 decimeters, and the perimeter of the remaining board is 36 decimeters. What is the perimeter of the original board

36+2+2=40
Because the two widths have not changed, but the two lengths are less than 2 decimeters (note that the two lengths are less than 2 decimeters), so the original perimeter is 40

Cut off the length of a rectangular board by 2 decimeters, and the perimeter of the remaining board is 36 decimeters. What is the original perimeter of the board

The perimeter of the original board is: 36 + 2 × 2 = 40 decimeters

A semicircular part with a diameter of 4cm has a circumference of () and an area of ()

4 × 3.14 △ 2 + 4 = 6.28 + 4 = 10.28cm
(4 / 2) & # 178; × 3.14 △ 2 = 6.28 square centimeter

The perimeter of a rectangular board is 80 decimeters, and the ratio of width to length is 3:5. Saw the largest round table on the board. What is the area of the round table Decimeter?